<template>
  <!-- 使用 grid 网格布局，并指定列数为 2，高度占满全屏 -->
  <div class="grid grid-cols-2 h-screen">
    <!-- 默认占两列，order 用于指定排列顺序，md 用于适配非移动端（PC 端） -->
    <div class="col-span-2 order-2 p-10 md:col-span-1 md:order-1 bg-slate-900">
      <!-- 指定为 flex 布局，并设置为屏幕垂直水平居中，高度为 100% -->
      <div
          class="flex justify-center items-center h-full flex-col animate__animated animate__bounceInLeft animate__fast">
        <h2 class="font-bold text-4xl mb-7 text-white">Weblog 博客登录</h2>
        <p class="text-white">一款由 Spring Boot + Mybaits Plus + Vue 3.2 + Vite 4 开发的前后端分离博客。</p>
        <!-- 指定图片宽度为父级元素的 1/2 -->
        <img src="@/assets/developer.png" class="w-1/2">
      </div>
    </div>
    <div class="flex flex-col col-span-2 order-1 md:col-span-1 md:order-2 bg-white dark:bg-gray-800">

      <!-- 黑夜白天开关 -->
      <label class="switch ml-auto mt-4 mr-4">
        <input type="checkbox" v-model="isLight" @click="toggleDark()">
        <span class="slider"></span>
      </label>

      <!-- flex-col 用于指定子元素垂直排列 -->
      <div
          class="flex justify-center items-center h-full flex-col animate__animated animate__bounceInRight animate__fast">
        <!-- 大标题，设置字体粗细、大小、下边距 -->
        <h1 class="font-bold text-4xl mb-5 dark:text-white">欢迎回来</h1>
        <!-- 设置 flex 布局，内容垂直水平居中，文字颜色，以及子内容水平方向 x 轴间距 -->
        <div class="flex items-center justify-center mb-7 text-gray-400 space-x-2 dark:text-gray-500">
          <!-- 左边横线，高度为 1px, 宽度为 16，背景色设置 -->
          <span class="h-[1px] w-16 bg-gray-200 dark:bg-gray-700"></span>
          <span>账号密码登录</span>
          <span style="font-size: 12px;margin-left: 10px">没有帐号？<router-link to="/register"
                                                                                style="color: blue">去注册</router-link></span>

          <!-- 右边横线 -->
          <span class="h-[1px] w-16 bg-gray-200 dark:bg-gray-700"></span>
        </div>
        <!-- 引入 Element Plus 表单组件，移动端设置宽度为 5/6，PC 端设置为 2/5 -->
        <el-form class="w-5/6 md:w-2/5" ref="formRef" :rules="rules" :model="form">
          <el-form-item prop="username">
            <!-- 输入框组件 -->
            <el-input size="large" v-model="form.username" placeholder="请输入用户名" :prefix-icon="User" clearable/>
          </el-form-item>
          <el-form-item prop="password">
            <!-- 密码框组件 -->
            <el-input size="large" type="password" v-model="form.password" placeholder="请输入密码"
                      :prefix-icon="Lock" clearable show-password/>
          </el-form-item>
          <el-form-item>
            <!-- 登录按钮，宽度设置为 100% -->
            <el-button class="w-full mt-2" size="large" :loading="loading" type="primary" @click="onSubmit">登录
            </el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script setup>
// 引入 Element Plus 中的用户、锁图标
import {User, Lock} from '@element-plus/icons-vue'
import {login} from '@/api/admin/user'
import {ref, reactive, onMounted, onBeforeUnmount} from 'vue'
import {useRouter,useRoute} from 'vue-router'
import {showMessage} from '@/composables/util'
import {setToken} from '@/composables/cookie'
import {useUserStore} from '@/stores/user'
import {useDark, useToggle} from '@vueuse/core'
import {initDropdowns} from "flowbite";

const userStore = useUserStore()

// 定义响应式的表单对象
const form = reactive({
  username: '',
  password: ''
})

const router = useRouter()
const route = useRoute()
// 登录按钮加载
const loading = ref(false)

// 表单引用
const formRef = ref(null)
// 表单验证规则
const rules = {
  username: [
    {
      required: true,
      message: '用户名不能为空',
      trigger: 'blur'
    }
  ],
  password: [
    {
      required: true,
      message: '密码不能为空',
      trigger: 'blur',
    },
  ]
}

const onSubmit = () => {
  console.log('登录')
  // 先验证 form 表单字段
  formRef.value.validate((valid) => {
    if (!valid) {
      console.log('表单验证不通过')
      return false
    }
    // 开始加载
    loading.value = true

    // 调用登录接口
    login(form.username, form.password).then(async (res) => {
      console.log(res)
      // 判断是否成功
      if (res.success === true) {
        // 提示登录成功
        showMessage('登录成功')

        // 存储 Token 到 Cookie 中
        let token = res.data.token
        setToken(token)

        // 获取用户信息，并存储到全局状态中
        await userStore.setUserInfo()

        // 修改登录成功后的跳转逻辑
        const redirect = route.query.redirect || '/'
        await router.push(redirect)
      } else {
        // 获取服务端返回的错误消息
        let message = res.message
        // 提示消息
        showMessage(message, 'error')
      }
    })
        .finally(() => {
          // 结束加载
          loading.value = false
        })
  })
}

// 按回车键后，执行登录事件
function onKeyUp(e) {
  console.log(e)
  if (e.key == 'Enter') {
    onSubmit()
  }
}

// 添加键盘监听
onMounted(() => {
  console.log('添加键盘监听')
  document.addEventListener('keyup', onKeyUp)
})

// 移除键盘监听
onBeforeUnmount(() => {
  document.removeEventListener('keyup', onKeyUp)
})

// 是否是白天
const isLight = ref(true)
const isDark = useDark({
  onChanged(dark) {
    // update the dom, call the API or something
    console.log('onchange:' + dark)
    if (dark) {
      // 给 body 添加 class="dark"
      document.documentElement.classList.add('dark');
      // 设置 switch 的值
      isLight.value = false
    } else {
      // 移除 body 中添加 class="dark"
      document.documentElement.classList.remove('dark');
      isLight.value = true
    }
  },
})
const toggleDark = useToggle(isDark)
</script>

<style scoped>
/* The switch - the box around the slider */
.switch {
  font-size: 14px;
  position: relative;
  display: inline-block;
  width: 3.5em;
  height: 2em;
}

/* Hide default HTML checkbox */
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

/* The slider */
.slider {
  --background: #28096b;
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--background);
  transition: .5s;
  border-radius: 30px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 1.4em;
  width: 1.4em;
  border-radius: 50%;
  left: 10%;
  bottom: 15%;
  box-shadow: inset 8px -4px 0px 0px #fff000;
  background: var(--background);
  transition: .5s;
}

input:checked + .slider {
  background-color: #522ba7;
}

input:checked + .slider:before {
  transform: translateX(100%);
  box-shadow: inset 15px -4px 0px 15px #fff000;
}</style>